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To extract the conversations, load up your recordings into a sound editor like Audacity. You can use any editor that shows you a waveform, Audacity is just an example and it's open-source (read: free) so it's a good starting point.

Look at the waveform. Chances are, the parts with conversations in them are going to have the highest sustained volume levels, since someone is speaking directly into the mic - so if you see a part that has a higher average level to it, give it a listen. You can trim these parts out manually and save them as new files or new tracks within the same editor project; however you want.

To reduce noise, the best solution I've personally ever seen used is Izotope RX, although it's fairly pricey. Audacity has a noise-reduction tool that I've never had much luck with, but you might give it a try.